Folding square.



PATENTED DEC. 6, 1904.

H. T. BUHMEIER. FOLDING SQUARE.

MPMCATION FILED MAY 24, 1904.

2 SHEETS-SHEET 1.

N0 MODEL.

L. fr l :1,0 am VVH ,.U /B T. r.v n) a H8 www N0 MODELy PATBNTED DEC. 6, 1904.

H. T. BUHMEIER.

FOLDING SQUARE'.

APPLIUATION FILED MAY 24, 1904.

2 SHEETS--SHEET 2.

liliimlif Him NiTnn STaTns Patented December 6, 1904.

lfaTnNT @Trice lFClPLIDlNG SQUARE..

SPECIFICATIQN forming part of Letters Patent No. 776,996, dated December G, 1904.

Application iiled May 24, 1904. Serial No. 209,473. (No model.)

To (L7/Z wil/mn, it 1H/(Ly concer/vt:

Be it known that l, HENRY' 'l Buimicmiu, a citizen of the United States, residing at Elgin, in the county of Kane and State of Illinois, have invented certain new and useful `lm provements in Folding' Squares; and I do hereby declare the followingto be a full, clear, and eX- act description of the invention, such as will enable others skilled inthe art to which itappertains to make and use the same.

My invention relates to improvements in squares. It has for its object to provide an adjustable square which will be rigid when its arms are extended at right angles with each other, but which can be readily adjusted to form diiferent angles when desired.

The invention consists of the details of construction and combination of parts hereinafter described, and more particularly pointed out in the claims.

In the accompanying drawings, illustrating' the preferred embodiment of my invention, Figure 1 is a plan view of the square with the ends of the arms broken away, showing' said arm held rigidly together atan angle of ninety degrees. Fig'. 2 is a reverse plan view thereof. Fig. 3 is a sectional view on line 3 3 of Fig. 1. Fig. L is a detail view of the auxiliary plate used when it is desired to vary the angle of the arms. Fig. 5 is a plan view of the same face of the square shown in Fig. l with the arms arranged at an acute angle to each other, the arm with the angular extension reversed and arranged above the auxiliary plate which is placed in the recess in which said angular extension iits when the arms are rigidly held at an angle of ninety degrees. Fig. 6 is a similar view, the arms being arranged at an acute angle and the arm with the angular extension arranged on the reverse side of the other arm. Figs. 7 andv 8 are reverse views of one arm of a modified form of square provided with lug's. Fig. 9

is a plan View of the other arm of the modified form provided with sockets for said lugs. Figs. 10 and 11 show different ways of using said modiiied form to draw different angles; and Fig. 12 is an end view of the arm with the lugs, showing the shape of the latter.

Referring' more particularly to the drawings, `in carrying out my invention I provide an arm 1, preferably of steel, having an angular extension 2 about one-half of its thickness, one edge of said extension being cut in and straight, as at 3, and the other cut in at lan angle, as at 4. On the other side of said arm the edge at the juncture of the thicker and thinner portions is preferably curved, as at 5, ending' at one side in a small angular piece 6. The other arm, 7, also preferably of steel. has a rounded lnojecting portion ol half the thickness of said arm adapted to lit the curved edge 5 ofthe other arm and having an angular eut-out portion 8 to fit the angular piece 6, the purpose of which is to hold the arms rigid. Said arm 7 is also provided with a recess 9, correspomling in shape to and adapted to receive the angular extension 2. Two perforations are provided in said arms, one in the projection of each and the other in the recess of the arm 7 and in the portion of the arm 1 opposite the extension of the arm 7 when the arms are rigidly held together at right angles. The perforations in each arm register with those in the other when said arms are arranged as in Figs. 1 and 2, and said perforations are preferably screw-threaded and countersunk, so that they are adapted to receive short screw-bolts to hold the arms rigidly together.

If it is desired to adjust the arms at an an gle of less than ninety degrees, the bolts are removed, the arms taken apart, the auxiliary plate 9 (shown in Fig. Il placed in the recess in the arm 7, and the arm 1 reversed and pivoted to the arm 7 by one of the bolts passed through the inner perforation in the extension of the arm 7. The arm 1 may be placed on either face of the arm 7, as shown in Figs. and 6, and a scale of angles may be placed on the back of said arm 7 and on the auxiliary plate, said scale to be read by either edge of the projection Q of the arm 1.

In the modiiied form shown in Figs. 7 to 12 each arm has an angular projection. The projection on one arm, 1, is provided with L- shaped lugs 11, preferably two in number, arranged at the edge of theprojection and reaching thereover. The other arm, 7, has sockets 1Q, corresponding in shape to said IOO lugs and arranged at the edge of the thicker portion at the juncture of the thinner portion, so that when said arms are arranged so that the lugs of one engage the sockets of the other said arms will make an angle of ninety degrees with each other and the thickness of the square throughout will be the same. Perforations may be provided in the thinner portions of each arm for the purpose of securing them together and also in the thicker ends of said arms, so that said arms may be pivoted in different positions, as shown in Figs. lO and 11. A scale of angles is also indicated on the face of the thinner portion of one of said arms.

I am aware that changes may be made in my invention without departing from the spirit or sacrificing the advantages thereof. I therefore reserve the right to make such 2O changes as fairly fall within the scope of my invention.

are rigidly held against displacement with relation to each other in the plane of said arms.

2. An adjustable square comprising two arms, each arm having an angular lateral eX- tension, lugs arranged on the extension of one of said arms and adapted to engage corresponding sockets in the other arm whereby said arms are secured against displacement with relation to each other in the plane of said arms.

3. An adjustable square comprising twov HENRY T. BUHMEIER.

Vitnesses:

CHAs. J. FOLEY, W. C. HoRNBRooK. 

